/*
 * Copyright (c) 1997, 2012, Oracle and/or its affiliates. All rights reserved.
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
 * This code is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 only, as
 * published by the Free Software Foundation.  Oracle designates this
 * particular file as subject to the "Classpath" exception as provided
 * by Oracle in the LICENSE file that accompanied this code.
 *
 * This code is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
 *
 * You should have received a copy of the GNU General Public License version
 * 2 along with this work; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
 *
 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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package com.sun.xml.internal.ws.addressing;

import com.sun.istack.internal.Nullable;
import com.sun.istack.internal.NotNull;
import com.sun.xml.internal.stream.buffer.XMLStreamBufferSource;
import com.sun.xml.internal.stream.buffer.stax.StreamWriterBufferCreator;
import com.sun.xml.internal.ws.api.addressing.AddressingVersion;
import com.sun.xml.internal.ws.developer.MemberSubmissionEndpointReference;
import com.sun.xml.internal.ws.util.DOMUtil;
import com.sun.xml.internal.ws.util.xml.XmlUtil;
import com.sun.xml.internal.ws.wsdl.parser.WSDLConstants;
import com.sun.xml.internal.ws.addressing.v200408.MemberSubmissionAddressingConstants;
import org.w3c.dom.*;

import javax.xml.namespace.QName;
import javax.xml.stream.XMLStreamException;
import javax.xml.transform.dom.DOMResult;
import javax.xml.ws.EndpointReference;
import javax.xml.ws.WebServiceException;
import javax.xml.ws.wsaddressing.W3CEndpointReference;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.Map;

/**
 * @author Rama Pulavarthi
 */

public class EndpointReferenceUtil {
    /**
     * Gives the EPR based on the clazz. It may need to perform tranformation from
     * W3C EPR to MS EPR or vise-versa.
     */
    public static <T extends EndpointReference> T transform(Class<T> clazz, @NotNull EndpointReference epr) {
        assert epr != null;
        if (clazz.isAssignableFrom(W3CEndpointReference.class)) {
            if (epr instanceof W3CEndpointReference) {
                return (T) epr;
            } else if (epr instanceof MemberSubmissionEndpointReference) {
                return (T) toW3CEpr((MemberSubmissionEndpointReference) epr);
            }
        } else if (clazz.isAssignableFrom(MemberSubmissionEndpointReference.class)) {
            if (epr instanceof W3CEndpointReference) {
                return (T) toMSEpr((W3CEndpointReference) epr);
            } else if (epr instanceof MemberSubmissionEndpointReference) {
                return (T) epr;
            }
        }

        //This must be an EPR that we dont know
        throw new WebServiceException("Unknwon EndpointReference: " + epr.getClass());
    }

    //TODO: bit of redundency on writes of w3c epr, should modularize it
    private static W3CEndpointReference toW3CEpr(MemberSubmissionEndpointReference msEpr) {
        StreamWriterBufferCreator writer = new StreamWriterBufferCreator();
        w3cMetadataWritten = false;
        try {
            writer.writeStartDocument();
            writer.writeStartElement(AddressingVersion.W3C.getPrefix(),
                    "EndpointReference", AddressingVersion.W3C.nsUri);
            writer.writeNamespace(AddressingVersion.W3C.getPrefix(),
                    AddressingVersion.W3C.nsUri);
            //write wsa:Address
            writer.writeStartElement(AddressingVersion.W3C.getPrefix(),
                    AddressingVersion.W3C.eprType.address
                    , AddressingVersion.W3C.nsUri);
            writer.writeCharacters(msEpr.addr.uri);
            writer.writeEndElement();
            //TODO: write extension attributes on wsa:Address
            if ((msEpr.referenceProperties != null && msEpr.referenceProperties.elements.size() > 0) ||
                    (msEpr.referenceParameters != null && msEpr.referenceParameters.elements.size() > 0)) {

                writer.writeStartElement(AddressingVersion.W3C.getPrefix(), "ReferenceParameters", AddressingVersion.W3C.nsUri);

                //write ReferenceProperties
                if (msEpr.referenceProperties != null) {
                    for (Element e : msEpr.referenceProperties.elements) {
                        DOMUtil.serializeNode(e, writer);
                    }
                }
                //write referenceParameters
                if (msEpr.referenceParameters != null) {
                    for (Element e : msEpr.referenceParameters.elements) {
                        DOMUtil.serializeNode(e, writer);
                    }
                }
                writer.writeEndElement();
            }
            // Supress writing ServiceName and EndpointName in W3CEPR,
            // Until the ns for those metadata elements is resolved.
            /*
            //Write Interface info
            if (msEpr.portTypeName != null) {
                writeW3CMetadata(writer);
                writer.writeStartElement(AddressingVersion.W3C.getWsdlPrefix(),
                        AddressingVersion.W3C.eprType.portTypeName ,
                        AddressingVersion.W3C.wsdlNsUri);
                writer.writeNamespace(AddressingVersion.W3C.getWsdlPrefix(),
                        AddressingVersion.W3C.wsdlNsUri);
                String portTypePrefix = fixNull(msEpr.portTypeName.name.getPrefix());
                writer.writeNamespace(portTypePrefix, msEpr.portTypeName.name.getNamespaceURI());
                if (portTypePrefix.equals(""))
                    writer.writeCharacters(msEpr.portTypeName.name.getLocalPart());
                else
                    writer.writeCharacters(portTypePrefix + ":" + msEpr.portTypeName.name.getLocalPart());
                writer.writeEndElement();
            }
            if (msEpr.serviceName != null) {
                writeW3CMetadata(writer);
                //Write service and Port info
                writer.writeStartElement(AddressingVersion.W3C.getWsdlPrefix(),
                        AddressingVersion.W3C.eprType.serviceName ,
                        AddressingVersion.W3C.wsdlNsUri);
                writer.writeNamespace(AddressingVersion.W3C.getWsdlPrefix(),
                        AddressingVersion.W3C.wsdlNsUri);

                String servicePrefix = fixNull(msEpr.serviceName.name.getPrefix());
                if (msEpr.serviceName.portName != null)
                    writer.writeAttribute(AddressingVersion.W3C.eprType.portName,
                            msEpr.serviceName.portName);

                writer.writeNamespace(servicePrefix, msEpr.serviceName.name.getNamespaceURI());
                if (servicePrefix.length() > 0)
                    writer.writeCharacters(servicePrefix + ":" + msEpr.serviceName.name.getLocalPart());
                else
                    writer.writeCharacters(msEpr.serviceName.name.getLocalPart());
                writer.writeEndElement();
            }
            */
            //TODO: revisit this
            Element wsdlElement = null;
            //Check for wsdl in extension elements
            if ((msEpr.elements != null) && (msEpr.elements.size() > 0)) {
                for (Element e : msEpr.elements) {
                    if(e.getNamespaceURI().equals(MemberSubmissionAddressingConstants.MEX_METADATA.getNamespaceURI()) &&
                            e.getLocalName().equals(MemberSubmissionAddressingConstants.MEX_METADATA.getLocalPart())) {
                        NodeList nl = e.getElementsByTagNameNS(WSDLConstants.NS_WSDL,
                                WSDLConstants.QNAME_DEFINITIONS.getLocalPart());
                        if(nl != null) {
                            wsdlElement = (Element) nl.item(0);
                        }
                    }
                }
            }
            //write WSDL
            if (wsdlElement != null) {
                DOMUtil.serializeNode(wsdlElement, writer);
            }

            if (w3cMetadataWritten) {
                writer.writeEndElement();
            }
            //TODO revisit this
            //write extension elements
            if ((msEpr.elements != null) && (msEpr.elements.size() > 0)) {
                for (Element e : msEpr.elements) {
                    if (e.getNamespaceURI().equals(WSDLConstants.NS_WSDL) &&
                            e.getLocalName().equals(WSDLConstants.QNAME_DEFINITIONS.getLocalPart())) {
                        // Don't write it as this is written already in Metadata
                    }
                    DOMUtil.serializeNode(e, writer);
                }
            }

            //TODO:write extension attributes

            //</EndpointReference>
            writer.writeEndElement();
            writer.writeEndDocument();
            writer.flush();
        } catch (XMLStreamException e) {
            throw new WebServiceException(e);
        }
        return new W3CEndpointReference(new XMLStreamBufferSource(writer.getXMLStreamBuffer()));
    }

    private static boolean w3cMetadataWritten = false;

//    private static void writeW3CMetadata(StreamWriterBufferCreator writer) throws XMLStreamException {
//        if (!w3cMetadataWritten) {
//            writer.writeStartElement(AddressingVersion.W3C.getPrefix(), AddressingVersion.W3C.eprType.wsdlMetadata.getLocalPart(), AddressingVersion.W3C.nsUri);
//            w3cMetadataWritten = true;
//        }
//    }
//
    private static MemberSubmissionEndpointReference toMSEpr(W3CEndpointReference w3cEpr) {
        DOMResult result = new DOMResult();
        w3cEpr.writeTo(result);
        Node eprNode = result.getNode();
        Element e = DOMUtil.getFirstElementChild(eprNode);
        if (e == null) {
            return null;
        }

        MemberSubmissionEndpointReference msEpr = new MemberSubmissionEndpointReference();

        NodeList nodes = e.getChildNodes();
        for (int i = 0; i < nodes.getLength(); i++) {
            if (nodes.item(i).getNodeType() == Node.ELEMENT_NODE) {
                Element child = (Element) nodes.item(i);
                if (child.getNamespaceURI().equals(AddressingVersion.W3C.nsUri) &&
                        child.getLocalName().equals(AddressingVersion.W3C.eprType.address)) {
                    if (msEpr.addr == null) {
                        msEpr.addr = new MemberSubmissionEndpointReference.Address();
                    }
                    msEpr.addr.uri = XmlUtil.getTextForNode(child);

                } else if (child.getNamespaceURI().equals(AddressingVersion.W3C.nsUri) &&
                        child.getLocalName().equals("ReferenceParameters")) {
                    NodeList refParams = child.getChildNodes();
                    for (int j = 0; j < refParams.getLength(); j++) {
                        if (refParams.item(j).getNodeType() == Node.ELEMENT_NODE) {
                            if (msEpr.referenceParameters == null) {
                                msEpr.referenceParameters = new MemberSubmissionEndpointReference.Elements();
                                msEpr.referenceParameters.elements = new ArrayList<Element>();
                            }
                            msEpr.referenceParameters.elements.add((Element) refParams.item(j));
                        }
                    }
                } else if (child.getNamespaceURI().equals(AddressingVersion.W3C.nsUri) &&
                        child.getLocalName().equals(AddressingVersion.W3C.eprType.wsdlMetadata.getLocalPart())) {
                    NodeList metadata = child.getChildNodes();
                    String wsdlLocation = child.getAttributeNS(W3CAddressingMetadataConstants.WSAM_WSDLI_ATTRIBUTE_NAMESPACE,
                            W3CAddressingMetadataConstants.WSAM_WSDLI_ATTRIBUTE_LOCALNAME);
                    Element wsdlDefinitions = null;
                    for (int j = 0; j < metadata.getLength(); j++) {
                        Node node = metadata.item(j);
                        if (node.getNodeType() != Node.ELEMENT_NODE) {
                            continue;
                        }

                        Element elm = (Element) node;
                        if ((elm.getNamespaceURI().equals(AddressingVersion.W3C.wsdlNsUri) ||
                                elm.getNamespaceURI().equals(W3CAddressingMetadataConstants.WSAM_NAMESPACE_NAME)) &&
                                elm.getLocalName().equals(AddressingVersion.W3C.eprType.serviceName)) {
                            msEpr.serviceName = new MemberSubmissionEndpointReference.ServiceNameType();
                            msEpr.serviceName.portName = elm.getAttribute(AddressingVersion.W3C.eprType.portName);

                            String service = elm.getTextContent();
                            String prefix = XmlUtil.getPrefix(service);
                            String name = XmlUtil.getLocalPart(service);

                            //if there is no service name then its not a valid EPR but lets continue as its optional anyway
                            if (name == null) {
                                continue;
                            }

                            if (prefix != null) {
                                String ns = elm.lookupNamespaceURI(prefix);
                                if (ns != null) {
                                    msEpr.serviceName.name = new QName(ns, name, prefix);
                                }
                            } else {
                                msEpr.serviceName.name = new QName(null, name);
                            }
                            msEpr.serviceName.attributes = getAttributes(elm);
                        } else if ((elm.getNamespaceURI().equals(AddressingVersion.W3C.wsdlNsUri) ||
                                elm.getNamespaceURI().equals(W3CAddressingMetadataConstants.WSAM_NAMESPACE_NAME)) &&
                                elm.getLocalName().equals(AddressingVersion.W3C.eprType.portTypeName)) {
                            msEpr.portTypeName = new MemberSubmissionEndpointReference.AttributedQName();

                            String portType = elm.getTextContent();
                            String prefix = XmlUtil.getPrefix(portType);
                            String name = XmlUtil.getLocalPart(portType);

                            //if there is no portType name then its not a valid EPR but lets continue as its optional anyway
                            if (name == null) {
                                continue;
                            }

                            if (prefix != null) {
                                String ns = elm.lookupNamespaceURI(prefix);
                                if (ns != null) {
                                    msEpr.portTypeName.name = new QName(ns, name, prefix);
                                }
                            } else {
                                msEpr.portTypeName.name = new QName(null, name);
                            }
                            msEpr.portTypeName.attributes = getAttributes(elm);
                        } else if(elm.getNamespaceURI().equals(WSDLConstants.NS_WSDL) &&
                                elm.getLocalName().equals(WSDLConstants.QNAME_DEFINITIONS.getLocalPart())) {
                            wsdlDefinitions = elm;
                        } else {
                            //TODO : Revisit this
                            //its extensions in META-DATA and should be copied to extensions in MS EPR
                            if (msEpr.elements == null) {
                                msEpr.elements = new ArrayList<Element>();
                            }
                            msEpr.elements.add(elm);
                        }
                    }


                    Document doc = DOMUtil.createDom();
                    Element mexEl = doc.createElementNS(MemberSubmissionAddressingConstants.MEX_METADATA.getNamespaceURI(),
                            MemberSubmissionAddressingConstants.MEX_METADATA.getPrefix() + ":"
                                    + MemberSubmissionAddressingConstants.MEX_METADATA.getLocalPart());
                    Element metadataEl = doc.createElementNS(MemberSubmissionAddressingConstants.MEX_METADATA_SECTION.getNamespaceURI(),
                            MemberSubmissionAddressingConstants.MEX_METADATA_SECTION.getPrefix() + ":"
                                    + MemberSubmissionAddressingConstants.MEX_METADATA_SECTION.getLocalPart());
                    metadataEl.setAttribute(MemberSubmissionAddressingConstants.MEX_METADATA_DIALECT_ATTRIBUTE,
                            MemberSubmissionAddressingConstants.MEX_METADATA_DIALECT_VALUE);
                    if (wsdlDefinitions == null && wsdlLocation != null && !wsdlLocation.equals("")) {
                        wsdlLocation = wsdlLocation.trim();
                        String wsdlTns = wsdlLocation.substring(0, wsdlLocation.indexOf(' '));
                        wsdlLocation = wsdlLocation.substring(wsdlLocation.indexOf(' ') + 1);
                        Element wsdlEl = doc.createElementNS(WSDLConstants.NS_WSDL,
                                WSDLConstants.PREFIX_NS_WSDL + ":"
                                        + WSDLConstants.QNAME_DEFINITIONS.getLocalPart());
                        Element wsdlImportEl = doc.createElementNS(WSDLConstants.NS_WSDL,
                                WSDLConstants.PREFIX_NS_WSDL + ":"
                                        + WSDLConstants.QNAME_IMPORT.getLocalPart());
                        wsdlImportEl.setAttribute("namespace", wsdlTns);
                        wsdlImportEl.setAttribute("location", wsdlLocation);
                        wsdlEl.appendChild(wsdlImportEl);
                        metadataEl.appendChild(wsdlEl);
                    } else if(wsdlDefinitions != null){
                        metadataEl.appendChild(wsdlDefinitions);
                    }
                    mexEl.appendChild(metadataEl);

                    if (msEpr.elements == null) {
                        msEpr.elements = new ArrayList<Element>();
                    }
                    msEpr.elements.add(mexEl);


                } else {
                    //its extensions
                    if (msEpr.elements == null) {
                        msEpr.elements = new ArrayList<Element>();
                    }
                    msEpr.elements.add((Element) child);

                }
            } else if (nodes.item(i).getNodeType() == Node.ATTRIBUTE_NODE) {
                Node n = nodes.item(i);
                if (msEpr.attributes == null) {
                    msEpr.attributes = new HashMap<QName, String>();
                    String prefix = fixNull(n.getPrefix());
                    String ns = fixNull(n.getNamespaceURI());
                    String localName = n.getLocalName();
                    msEpr.attributes.put(new QName(ns, localName, prefix), n.getNodeValue());
                }
            }
        }

        return msEpr;
    }

    private static Map<QName, String> getAttributes(Node node) {
        Map<QName, String> attribs = null;

        NamedNodeMap nm = node.getAttributes();
        for (int i = 0; i < nm.getLength(); i++) {
            if (attribs == null) {
                attribs = new HashMap<QName, String>();
            }
            Node n = nm.item(i);
            String prefix = fixNull(n.getPrefix());
            String ns = fixNull(n.getNamespaceURI());
            String localName = n.getLocalName();
            if (prefix.equals("xmlns") || prefix.length() == 0 && localName.equals("xmlns")) {
                continue;
            }

            //exclude some attributes
            if (!localName.equals(AddressingVersion.W3C.eprType.portName)) {
                attribs.put(new QName(ns, localName, prefix), n.getNodeValue());
            }
        }
        return attribs;
    }

    private static
    @NotNull
    String fixNull(@Nullable String s) {
        if (s == null) {
            return "";
        } else {
            return s;
        }
    }

}